How about making a link up top for games that might be included in the other categories but are "Online multiplayer" and/or "2 player" games for games like Boxhead zombies 2play?
I don't believe we need any more categories for AG, but you can search tags for games. To search a tag, just type Armorgames.com/tag/*Your tag*. You can search Multiplayer, or if your an explosion type of guy, search BOOM!. (:
